Method for tenant isolation in a distributed computing system

ABSTRACT

A method begins by processing modules of a dispersed storage network (DSN) allocating a plurality of DSN address ranges to DSN memories of the DSN and assigning DSN address ranges of the plurality of DSN address ranges to a first and second tenant of the DSN. The method continues by the processing modules receiving a write request for a data object segmented into first data segments from a first tenant of the DSN, and encoding the first data segments in accordance with first error encoding parameters. The method continues by the one or more processing modules receiving a write request for a data object from a second tenant of the DSN, and encoding the second data segments in accordance with second encoding parameters. The method then continues with the processing modules transmitting the first encoded data segments and the second encoded data segments to the DSN memories.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISC

Not applicable.

BACKGROUND OF THE INVENTION Technical Field of the Invention

This invention relates generally to computer networks and more particularly to dispersing error encoded data.

Description of Related Art

Computing devices are known to communicate data, process data, and/or store data. Such computing devices range from wireless smart phones, laptops, tablets, personal computers (PC), work stations, and video game devices, to data centers that support millions of web searches, stock trades, or on-line purchases every day. In general, a computing device includes a central processing unit (CPU), a memory system, user input/output interfaces, peripheral device interfaces, and an interconnecting bus structure.

As is further known, a computer may effectively extend its CPU by using “cloud computing” to perform one or more computing functions (e.g., a service, an application, an algorithm, an arithmetic logic function, etc.) on behalf of the computer. Further, for large services, applications, and/or functions, cloud computing may be performed by multiple cloud computing resources in a distributed manner to improve the response time for completion of the service, application, and/or function. For example, Hadoop is an open source software framework that supports distributed applications enabling application execution by thousands of computers.

In addition to cloud computing, a computer may use “cloud storage” as part of its memory system. As is known, cloud storage enables a user, via its computer, to store files, applications, etc. on an Internet storage system. The Internet storage system may include a RAID (redundant array of independent disks) system and/or a dispersed storage system that uses an error correction scheme to encode data for storage. Cloud storage systems may allow multiple users and even multiple tenants to access the same internet storage system.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

FIG. 1 is a schematic block diagram of an embodiment of a dispersed or distributed storage network (DSN) in accordance with the present invention;

FIG. 2 is a schematic block diagram of an embodiment of a computing core in accordance with the present invention;

FIG. 3 is a schematic block diagram of an example of dispersed storage error encoding of data in accordance with the present invention;

FIG. 4 is a schematic block diagram of a generic example of an error encoding function in accordance with the present invention;

FIG. 5 is a schematic block diagram of a specific example of an error encoding function in accordance with the present invention;

FIG. 6 is a schematic block diagram of an example of a slice name of an encoded data slice (EDS) in accordance with the present invention;

FIG. 7 is a schematic block diagram of an example of dispersed storage error decoding of data in accordance with the present invention;

FIG. 8 is a schematic block diagram of a generic example of an error decoding function in accordance with the present invention;

FIG. 9 is a schematic block diagram of an embodiment of decentralized, or distributed, agreement protocol (DAP) in accordance with the present invention;

FIG. 10 is a schematic block diagram of an example of a multi-tenant DSN in accordance with the present invention;

FIG. 11 is a flowchart of an example method of allocating DSN memory in a multi-tenant DSN in accordance with the present invention.

FIG. 12 is a flowchart of an example method of servicing an access request in a multi-tenant DSN in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 is a schematic block diagram of an embodiment of a dispersed, or distributed, storage network (DSN) 10 that includes a plurality of computing devices 12-16, a managing unit 18, an integrity processing unit 20, and a DSN memory 22. The components of the DSN 10 are coupled to a network 24, which may include one or more wireless and/or wire lined communication systems; one or more non-public intranet systems and/or public internet systems; and/or one or more local area networks (LAN) and/or wide area networks (WAN).

The DSN memory 22 includes a plurality of storage units 36 that may be located at geographically different sites (e.g., one in Chicago, one in Milwaukee, etc.), at a common site, or a combination thereof. For example, if the DSN memory 22 includes eight storage units 36, each storage unit is located at a different site. As another example, if the DSN memory 22 includes eight storage units 36, all eight storage units are located at the same site. As yet another example, if the DSN memory 22 includes eight storage units 36, a first pair of storage units are at a first common site, a second pair of storage units are at a second common site, a third pair of storage units are at a third common site, and a fourth pair of storage units are at a fourth common site. Note that a DSN memory 22 may include more or less than eight storage units 36. Further note that each storage unit 36 includes a computing core (as shown in FIG. 2, or components thereof) and a plurality of memory devices for storing dispersed error encoded data.

Each of the computing devices 12-16, the managing unit 18, and the integrity processing unit 20 include a computing core 26, which includes network interfaces 30-33. Computing devices 12-16 may each be a portable computing device and/or a fixed computing device. A portable computing device may be a social networking device, a gaming device, a cell phone, a smart phone, a digital assistant, a digital music player, a digital video player, a laptop computer, a handheld computer, a tablet, a video game controller, and/or any other portable device that includes a computing core. A fixed computing device may be a computer (PC), a computer server, a cable set-top box, a satellite receiver, a television set, a printer, a fax machine, home entertainment equipment, a video game console, and/or any type of home or office computing equipment. Note that each of the managing unit 18 and the integrity processing unit 20 may be separate computing devices, may be a common computing device, and/or may be integrated into one or more of the computing devices 12-16 and/or into one or more of the storage units 36.

Each interface 30, 32, and 33 includes software and hardware to support one or more communication links via the network 24 indirectly and/or directly. For example, interface 30 supports a communication link (e.g., wired, wireless, direct, via a LAN, via the network 24, etc.) between computing devices 14 and 16. As another example, interface 32 supports communication links (e.g., a wired connection, a wireless connection, a LAN connection, and/or any other type of connection to/from the network 24) between computing devices 12 and 16 and the DSN memory 22. As yet another example, interface 33 supports a communication link for each of the managing unit 18 and the integrity processing unit 20 to the network 24.

Computing devices 12 and 16 include a dispersed storage (DS) client module 34, which enables the computing device to dispersed storage error encode and decode data (e.g., data 40) as subsequently described with reference to one or more of FIGS. 3-8. In this example embodiment, computing device 16 functions as a dispersed storage processing agent for computing device 14. In this role, computing device 16 dispersed storage error encodes and decodes data on behalf of computing device 14. With the use of dispersed storage error encoding and decoding, the DSN 10 is tolerant of a significant number of storage unit failures (the number of failures is based on parameters of the dispersed storage error encoding function) without loss of data and without the need for a redundant or backup copies of the data. Further, the DSN 10 stores data for an indefinite period of time without data loss and in a secure manner (e.g., the system is very resistant to unauthorized attempts at accessing the data).

In operation, the managing unit 18 performs DS management services. For example, the managing unit 18 establishes distributed data storage parameters (e.g., vault creation, distributed storage parameters, security parameters, billing information, user profile information, etc.) for computing devices 12-14 individually or as part of a group of user devices. As a specific example, the managing unit 18 coordinates creation of a vault (e.g., a virtual memory block associated with a portion of an overall namespace of the DSN) within the DSN memory 22 for a user device, a group of devices, or for public access and establishes per vault dispersed storage (DS) error encoding parameters for a vault. The managing unit 18 facilitates storage of DS error encoding parameters for each vault by updating registry information of the DSN 10, where the registry information may be stored in the DSN memory 22, a computing device 12-16, the managing unit 18, and/or the integrity processing unit 20.

The managing unit 18 creates and stores user profile information (e.g., an access control list (ACL)) in local memory and/or within memory of the DSN memory 22. The user profile information includes authentication information, permissions, and/or the security parameters. The security parameters may include encryption/decryption scheme, one or more encryption keys, key generation scheme, and/or data encoding/decoding scheme.

The managing unit 18 creates billing information for a particular user, a user group, a vault access, public vault access, etc. For instance, the managing unit 18 tracks the number of times a user accesses a non-public vault and/or public vaults, which can be used to generate a per-access billing information. In another instance, the managing unit 18 tracks the amount of data stored and/or retrieved by a user device and/or a user group, which can be used to generate a per-data-amount billing information.

As another example, the managing unit 18 performs network operations, network administration, and/or network maintenance. Network operations includes authenticating user data allocation requests (e.g., read and/or write requests), managing creation of vaults, establishing authentication credentials for user devices, adding/deleting components (e.g., user devices, storage units, and/or computing devices with a DS client module 34) to/from the DSN 10, and/or establishing authentication credentials for the storage units 36. Network administration includes monitoring devices and/or units for failures, maintaining vault information, determining device and/or unit activation status, determining device and/or unit loading, and/or determining any other system level operation that affects the performance level of the DSN 10. Network maintenance includes facilitating replacing, upgrading, repairing, and/or expanding a device and/or unit of the DSN 10.

The integrity processing unit 20 performs rebuilding of ‘bad’ or missing encoded data slices. At a high level, the integrity processing unit 20 performs rebuilding by periodically attempting to retrieve/list encoded data slices, and/or slice names of the encoded data slices, from the DSN memory 22. For retrieved encoded slices, they are checked for errors due to data corruption, outdated version, etc. If a slice includes an error, it is flagged as a ‘bad’ slice. For encoded data slices that were not received and/or not listed, they are flagged as missing slices. Bad and/or missing slices are subsequently rebuilt using other retrieved encoded data slices that are deemed to be good slices to produce rebuilt slices. The rebuilt slices are stored in the DSN memory 22.

FIG. 2 is a schematic block diagram of an embodiment of a computing core 26 that includes a processing module 50, a memory controller 52, main memory 54, a video graphics processing unit 55, an input/output (IO) controller 56, a peripheral component interconnect (PCI) interface 58, an IO interface module 60, at least one IO device interface module 62, a read only memory (ROM) basic input output system (BIOS) 64, and one or more memory interface modules. The one or more memory interface module(s) includes one or more of a universal serial bus (USB) interface module 66, a host bus adapter (HBA) interface module 68, a network interface module 70, a flash interface module 72, a hard drive interface module 74, and a DSN interface module 76.

The DSN interface module 76 functions to mimic a conventional operating system (OS) file system interface (e.g., network file system (NFS), flash file system (FFS), disk file system (DFS), file transfer protocol (FTP), web-based distributed authoring and versioning (WebDAV), etc.) and/or a block memory interface (e.g., small computer system interface (SCSI), interne small computer system interface (iSCSI), etc.). The DSN interface module 76 and/or the network interface module 70 may function as one or more of the interface 30-33 of FIG. 1. Note that the IO device interface module 62 and/or the memory interface modules 66-76 may be collectively or individually referred to as IO ports.

FIG. 3 is a schematic block diagram of an example of dispersed storage error encoding of data. When a computing device 12 or 16 has data to store it disperse storage error encodes the data in accordance with a dispersed storage error encoding process based on dispersed storage error encoding parameters. The dispersed storage error encoding parameters include an encoding function (e.g., information dispersal algorithm, Reed-Solomon, Cauchy Reed-Solomon, systematic encoding, non-systematic encoding, on-line codes, etc.), a data segmenting protocol (e.g., data segment size, fixed, variable, etc.), and per data segment encoding values. The per data segment encoding values include a total, or pillar width, number (T) of encoded data slices per encoding of a data segment (i.e., in a set of encoded data slices); a decode threshold number (D) of encoded data slices of a set of encoded data slices that are needed to recover the data segment; a read threshold number (R) of encoded data slices to indicate a number of encoded data slices per set to be read from storage for decoding of the data segment; and/or a write threshold number (W) to indicate a number of encoded data slices per set that must be accurately stored before the encoded data segment is deemed to have been properly stored. The dispersed storage error encoding parameters may further include slicing information (e.g., the number of encoded data slices that will be created for each data segment) and/or slice security information (e.g., per encoded data slice encryption, compression, integrity checksum, etc.).

In the present example, Cauchy Reed-Solomon has been selected as the encoding function (a generic example is shown in FIG. 4 and a specific example is shown in FIG. 5); the data segmenting protocol is to divide the data object into fixed sized data segments; and the per data segment encoding values include: a pillar width of 5, a decode threshold of 3, a read threshold of 4, and a write threshold of 4. In accordance with the data segmenting protocol, the computing device 12 or 16 divides the data (e.g., a file (e.g., text, video, audio, etc.), a data object, or other data arrangement) into a plurality of fixed sized data segments (e.g., 1 through Y of a fixed size in range of Kilo-bytes to Tera-bytes or more). The number of data segments created is dependent of the size of the data and the data segmenting protocol.

The computing device 12 or 16 then disperse storage error encodes a data segment using the selected encoding function (e.g., Cauchy Reed-Solomon) to produce a set of encoded data slices. FIG. 4 illustrates a generic Cauchy Reed-Solomon encoding function, which includes an encoding matrix (EM), a data matrix (DM), and a coded matrix (CM). The size of the encoding matrix (EM) is dependent on the pillar width number (T) and the decode threshold number (D) of selected per data segment encoding values. To produce the data matrix (DM), the data segment is divided into a plurality of data blocks and the data blocks are arranged into D number of rows with Z data blocks per row. Note that Z is a function of the number of data blocks created from the data segment and the decode threshold number (D). The coded matrix is produced by matrix multiplying the data matrix by the encoding matrix.

FIG. 5 illustrates a specific example of Cauchy Reed-Solomon encoding with a pillar number (T) of five and decode threshold number of three. In this example, a first data segment is divided into twelve data blocks (D1-D12). The coded matrix includes five rows of coded data blocks, where the first row of X11-X14 corresponds to a first encoded data slice (EDS 1_1), the second row of X21-X24 corresponds to a second encoded data slice (EDS 2_1), the third row of X31-X34 corresponds to a third encoded data slice (EDS 3_1), the fourth row of X41-X44 corresponds to a fourth encoded data slice (EDS 4_1), and the fifth row of X51-X54 corresponds to a fifth encoded data slice (EDS 5_1). Note that the second number of the EDS designation corresponds to the data segment number.

Returning to the discussion of FIG. 3, the computing device also creates a slice name (SN) for each encoded data slice (EDS) in the set of encoded data slices. A typical format for a slice name 80 is shown in FIG. 6. As shown, the slice name (SN) 80 includes a pillar number of the encoded data slice (e.g., one of 1-T), a data segment number (e.g., one of 1-Y), a vault identifier (ID), a data object identifier (ID), and may further include revision level information of the encoded data slices. The slice name functions as, at least part of, a DSN address for the encoded data slice for storage and retrieval from the DSN memory 22.

As a result of encoding, the computing device 12 or 16 produces a plurality of sets of encoded data slices, which are provided with their respective slice names to the storage units for storage. As shown, the first set of encoded data slices includes EDS 1_1 through EDS 5_1 and the first set of slice names includes SN 1_1 through SN 5_1 and the last set of encoded data slices includes EDS 1_Y through EDS 5_Y and the last set of slice names includes SN 1_Y through SN 5_Y.

FIG. 7 is a schematic block diagram of an example of dispersed storage error decoding of a data object that was dispersed storage error encoded and stored in the example of FIG. 4. In this example, the computing device 12 or 16 retrieves from the storage units at least the decode threshold number of encoded data slices per data segment. As a specific example, the computing device retrieves a read threshold number of encoded data slices.

To recover a data segment from a decode threshold number of encoded data slices, the computing device uses a decoding function as shown in FIG. 8. As shown, the decoding function is essentially an inverse of the encoding function of FIG. 4. The coded matrix includes a decode threshold number of rows (e.g., three in this example) and the decoding matrix in an inversion of the encoding matrix that includes the corresponding rows of the coded matrix. For example, if the coded matrix includes rows 1, 2, and 4, the encoding matrix is reduced to rows 1, 2, and 4, and then inverted to produce the decoding matrix.

FIG. 9 is a schematic block diagram of an embodiment of a decentralized, or distributed agreement protocol (DAP) 80 that may be implemented by a computing device, a storage unit, and/or any other device or unit of the DSN to determine where to store encoded data slices or where to find stored encoded data slices. The DAP 80 includes a plurality of functional rating modules 81. Each of the functional rating modules 81 includes a deterministic function 83, a normalizing function 85, and a scoring function 87.

Each functional rating module 81 receives, as inputs, a slice identifier 82 and storage pool (SP) coefficients (e.g., a first functional rating module 81-1 receives SP 1 coefficients “a” and b). Based on the inputs, where the SP coefficients are different for each functional rating module 81, each functional rating module 81 generates a unique score 93 (e.g., an alpha-numerical value, a numerical value, etc.). The ranking function 84 receives the unique scores 93 and orders them based on an ordering function (e.g., highest to lowest, lowest to highest, alphabetical, etc.) and then selects one as a selected storage pool 86. Note that a storage pool includes one or more sets of storage units. Further note that the slice identifier 82 corresponds to a slice name or common attributes of set of slices names. For example, for a set of encoded data slices, the slice identifier 82 specifies a data segment number, a vault ID, and a data object ID, but leaves open ended, the pillar number. As another example, the slice identifier 82 specifies a range of slice names (e.g., 0000 0000 to FFFF FFFF).

As a specific example, the first functional rating module 81-1 receives the slice identifier 82 and SP coefficients for storage pool 1 of the DSN. The SP coefficients includes a first coefficient (e.g., “a”) and a second coefficient (e.g., “b”). For example, the first coefficient is a unique identifier for the corresponding storage pool (e.g., SP #1's ID for SP 1 coefficient “a”) and the second coefficient is a weighting factor for the storage pool. The weighting factors are derived to ensure, over time, data is stored in the storage pools in a fair and distributed manner based on the capabilities of the storage units within the storage pools.

For example, the weighting factor includes an arbitrary bias which adjusts a proportion of selections to an associated location such that a probability that a source name will be mapped to that location is equal to the location weight divided by a sum of all location weights for all locations of comparison (e.g., locations correspond to storage units). As a specific example, each storage pool is associated with a location weight factor based on storage capacity such that, storage pools with more storage capacity have a higher location weighting factor than storage pools with less storage capacity.

The deterministic function 83, which may be a hashing function, a hash-based message authentication code function, a mask generating function, a cyclic redundancy code function, hashing module of a number of locations, consistent hashing, rendezvous hashing, and/or a sponge function, performs a deterministic function on a combination and/or concatenation (e.g., add, append, interleave) of the slice identifier 82 and the first SP coefficient (e.g., SU 1 coefficient “a”) to produce an interim result 89.

The normalizing function 85 normalizes the interim result 89 to produce a normalized interim result 91. For instance, the normalizing function 85 divides the interim result 89 by a number of possible output permutations of the deterministic function 83 to produce the normalized interim result. For example, if the interim result is 4,325 (decimal) and the number of possible output permutations is 10,000, then the normalized result is 0.4325.

The scoring function 87 performs a mathematical function on the normalized result 91 to produce the score 93. The mathematical function may be division, multiplication, addition, subtraction, a combination thereof, and/or any mathematical operation. For example, the scoring function divides the second SP coefficient (e.g., SP 1 coefficient “b”) by the negative log of the normalized result (e.g., e^(y)=x and/or ln(x)=y). For example, if the second SP coefficient is 17.5 and the negative log of the normalized result is 1.5411 (e.g., e^(0.4235)), the score is 11.3555.

The ranking function 84 receives the scores 93 from each of the function rating modules 81 and orders them to produce a ranking of the storage pools. For example, if the ordering is highest to lowest and there are five storage units in the DSN, the ranking function evaluates the scores for five storage units to place them in a ranked order. From the ranking, the ranking module 84 selects one the storage pools 86, which is the target for a set of encoded data slices.

The DAP 80 may further be used to identify a set of storage units, an individual storage unit, and/or a memory device within the storage unit. To achieve different output results, the coefficients are changed according to the desired location information. The DAP 80 may also output the ranked ordering of the scores.

The DSN can leverage physical storage for use by multiple users. In addition, the DSN can leverage physical storage for multiple external tenants (“tenants”), where each tenant may be associated with one or more users. Examples of tenants include, but are not limited to, identity management systems, key management systems, certificate of authority systems, billing systems, operational systems, as well as DSN memory protocol and behavior configuration. In circumstances where a common DSN memory is shared between multiple external tenants (for example, groups of users, organizations, or service providers leveraging shared physical storage), it may be desirable for the DSN memory to provide isolation so that each tenant can configure and integrate DSN memory independent of other external tenants.

One aspect of tenant isolation is the provisioning of auxiliary services that are tangential to interaction with the DSN memory. For example, auxiliary services can include systems for authentication, such that each tenant may have its own authentication service (specified in the unique configuration for a given tenant). In this example user logins, or authorization checks could be confirmed before processing the request. Another aspect provides for key managing systems, wherein each tenant may have and operate its own key management system (KMS). A request may include information pertaining to encryption keys, and the DS processing unit may use the tenant specified KMS in order to access any encryption keys associated with the request.

In yet another example, tenant isolation can be used to provide sophisticated systems for billing, where each tenant may operate its own usage tracking and billing services. In this example the billing agent would be notified of any adjustments for use of the DSN by users accessing the storage resources governed by a particular tenant. For example, if a user issues a write request for 1 GB of data, the tenant's billing services could be notified to identify the user responsible for the increase in utilization and at what time, allowing the tenant's billing system to track the change. In each of these examples above external services can be separately managed by different tenants, allowing interaction with them as required to service the request.

In order to facilitate the sharing of common DSN memory between multiple tenants the DSN memory can determine mapping relationships with tenants and different external systems and configurations. FIG. 10 is a schematic block diagram of another embodiment of a dispersed storage network (DSN) that includes tenants 1-X, the network 24 of FIG. 1, the DSN memory of FIG. 1 and the computing device 16 of FIG. 1. In this case the DSN memory of FIG. 1 illustrates exemplary DSN address ranges available to computing device 16 for Tenants 1-X. For example, Tenant 1 may be assigned DSN address range 0-999, Tenant 2 may be assigned DSN address range 1000-1999, with Tenants 3-X being assigned the remaining DSN address ranges available in DSN memory. The assignment of DSN address ranges is primarily executed during the initial setup of the DSN, however, address re-assignment could occur periodically as needed.

The DSN address ranges of DSN memory 22 provide isolation, such that each tenant can manage the assigned memory independently, with different dispersed error encoding parameters available to each tenant. The DSN addresses could be assigned by computing device 16 of FIG. 1, or by any other system level device to ensure consistent allocation of DSN address ranges to virtual DSN systems. The assigned tenant address ranges effectively allow the DSN to enable each DSN tenant with its own “virtual” DSN, such that each tenant is able to set its own encoding parameters independent of other DSN entities.

Once a tenant has been assigned an address range a computing device, a storage unit, and/or any other device or unit of the DSN may implement a tenant specific DAP to determine where to store encoded data slices or where to find stored encoded data slices as illustrated above in FIG. 9. Alternatively, system level DAP, such as that illustrated in FIG. 9 may be incorporated.

FIG. 11 is a flowchart of an example method of allocating DSN memory in a multi-tenant DSN. The method begins by a DS processing unit allocating logical storage address ranges for use by tenants 1-X of the DSN. The method continues with the DS processing unit receiving a write request for servicing from a tenant, where the write request includes configuration data that may be used for mapping. When the request is received the DS processing unit determines which tenant of tenant 1-X originated the request. Tenants may be identified by using authentication information, identity information, other metadata of even side-channel information associated with the request. Examples include, but are not limited to authentication information provided by the requester, including user identifiers, associated group or organization data, and unique data associated with a tenant owned authentication system, such as a reseller prefix controlled by a set of authentication servers. Network related information may also be examined to locate tenant identifying data, examples include source network (lookup), associated network domains and specific source host. or IP information. Objects, files, container, buckets or vaults may also be examined through the request.

FIG. 12 is a flowchart of an example method of servicing a request in a multi-tenant DSN. The method begins with the DS processor receiving a request from a particular tenant; the DS processor then accesses information associated with the request (described above with regard to FIG. 11) and establishes which tenant originated the request. Once the requester to tenant mapping has been completed the DS processor is then able to inform the requester of the external systems associated with the particular tenant. The requester is then able to interact directly with those systems.

It is noted that terminologies as may be used herein such as bit stream, stream, signal sequence, etc. (or their equivalents) have been used interchangeably to describe digital information whose content corresponds to any of a number of desired types (e.g., data, video, speech, audio, etc. any of which may generally be referred to as ‘data’).

As may be used herein, the terms “substantially” and “approximately” provides an industry-accepted tolerance for its corresponding term and/or relativity between items. Such an industry-accepted tolerance ranges from less than one percent to fifty percent and corresponds to, but is not limited to, component values, integrated circuit process variations, temperature variations, rise and fall times, and/or thermal noise. Such relativity between items ranges from a difference of a few percent to magnitude differences. As may also be used herein, the term(s) “configured to”, “operably coupled to”, “coupled to”, and/or “coupling” includes direct coupling between items and/or indirect coupling between items via an intervening item (e.g., an item includes, but is not limited to, a component, an element, a circuit, and/or a module) where, for an example of indirect coupling, the intervening item does not modify the information of a signal but may adjust its current level, voltage level, and/or power level. As may further be used herein, inferred coupling (i.e., where one element is coupled to another element by inference) includes direct and indirect coupling between two items in the same manner as “coupled to”. As may even further be used herein, the term “configured to”, “operable to”, “coupled to”, or “operably coupled to” indicates that an item includes one or more of power connections, input(s), output(s), etc., to perform, when activated, one or more its corresponding functions and may further include inferred coupling to one or more other items. As may still further be used herein, the term “associated with”, includes direct and/or indirect coupling of separate items and/or one item being embedded within another item.

As may be used herein, the term “compares favorably”, indicates that a comparison between two or more items, signals, etc., provides a desired relationship. For example, when the desired relationship is that signal 1 has a greater magnitude than signal 2, a favorable comparison may be achieved when the magnitude of signal 1 is greater than that of signal 2 or when the magnitude of signal 2 is less than that of signal 1. As may be used herein, the term “compares unfavorably”, indicates that a comparison between two or more items, signals, etc., fails to provide the desired relationship.

As may also be used herein, the terms “processing module”, “processing circuit”, “processor”, and/or “processing unit” may be a single processing device or a plurality of processing devices. Such a processing device may be a microprocessor, micro-controller, digital signal processor, microcomputer, central processing unit, field programmable gate array, programmable logic device, state machine, logic circuitry, analog circuitry, digital circuitry, and/or any device that manipulates signals (analog and/or digital) based on hard coding of the circuitry and/or operational instructions. The processing module, module, processing circuit, and/or processing unit may be, or further include, memory and/or an integrated memory element, which may be a single memory device, a plurality of memory devices, and/or embedded circuitry of another processing module, module, processing circuit, and/or processing unit. Such a memory device may be a read-only memory, random access memory, volatile memory, non-volatile memory, static memory, dynamic memory, flash memory, cache memory, and/or any device that stores digital information. Note that if the processing module, module, processing circuit, and/or processing unit includes more than one processing device, the processing devices may be centrally located (e.g., directly coupled together via a wired and/or wireless bus structure) or may be distributedly located (e.g., cloud computing via indirect coupling via a local area network and/or a wide area network). Further note that if the processing module, module, processing circuit, and/or processing unit implements one or more of its functions via a state machine, analog circuitry, digital circuitry, and/or logic circuitry, the memory and/or memory element storing the corresponding operational instructions may be embedded within, or external to, the circuitry comprising the state machine, analog circuitry, digital circuitry, and/or logic circuitry. Still further note that, the memory element may store, and the processing module, module, processing circuit, and/or processing unit executes, hard coded and/or operational instructions corresponding to at least some of the steps and/or functions illustrated in one or more of the Figures. Such a memory device or memory element can be included in an article of manufacture.

One or more embodiments have been described above with the aid of method steps illustrating the performance of specified functions and relationships thereof. The boundaries and sequence of these functional building blocks and method steps have been arbitrarily defined herein for convenience of description. Alternate boundaries and sequences can be defined so long as the specified functions and relationships are appropriately performed. Any such alternate boundaries or sequences are thus within the scope and spirit of the claims. Further, the boundaries of these functional building blocks have been arbitrarily defined for convenience of description. Alternate boundaries could be defined as long as the certain significant functions are appropriately performed. Similarly, flow diagram blocks may also have been arbitrarily defined herein to illustrate certain significant functionality.

To the extent used, the flow diagram block boundaries and sequence could have been defined otherwise and still perform the certain significant functionality. Such alternate definitions of both functional building blocks and flow diagram blocks and sequences are thus within the scope and spirit of the claims. One of average skill in the art will also recognize that the functional building blocks, and other illustrative blocks, modules and components herein, can be implemented as illustrated or by discrete components, application specific integrated circuits, processors executing appropriate software and the like or any combination thereof.

In addition, a flow diagram may include a “start” and/or “continue” indication. The “start” and “continue” indications reflect that the steps presented can optionally be incorporated in or otherwise used in conjunction with other routines. In this context, “start” indicates the beginning of the first step presented and may be preceded by other activities not specifically shown. Further, the “continue” indication reflects that the steps presented may be performed multiple times and/or may be succeeded by other activities not specifically shown. Further, while a flow diagram indicates a particular ordering of steps, other orderings are likewise possible provided that the principles of causality are maintained.

The one or more embodiments are used herein to illustrate one or more aspects, one or more features, one or more concepts, and/or one or more examples. A physical embodiment of an apparatus, an article of manufacture, a machine, and/or of a process may include one or more of the aspects, features, concepts, examples, etc. described with reference to one or more of the embodiments discussed herein. Further, from figure to figure, the embodiments may incorporate the same or similarly named functions, steps, modules, etc. that may use the same or different reference numbers and, as such, the functions, steps, modules, etc. may be the same or similar functions, steps, modules, etc. or different ones.

Unless specifically stated to the contra, signals to, from, and/or between elements in a figure of any of the figures presented herein may be analog or digital, continuous time or discrete time, and single-ended or differential. For instance, if a signal path is shown as a single-ended path, it also represents a differential signal path. Similarly, if a signal path is shown as a differential path, it also represents a single-ended signal path. While one or more particular architectures are described herein, other architectures can likewise be implemented that use one or more data buses not expressly shown, direct connectivity between elements, and/or indirect coupling between other elements as recognized by one of average skill in the art.

The term “module” is used in the description of one or more of the embodiments. A module implements one or more functions via a device such as a processor or other processing device or other hardware that may include or operate in association with a memory that stores operational instructions. A module may operate independently and/or in conjunction with software and/or firmware. As also used herein, a module may contain one or more sub-modules, each of which may be one or more modules.

As may further be used herein, a computer readable memory includes one or more memory elements. A memory element may be a separate memory device, multiple memory devices, or a set of memory locations within a memory device. Such a memory device may be a read-only memory, random access memory, volatile memory, non-volatile memory, static memory, dynamic memory, flash memory, cache memory, and/or any device that stores digital information. The memory device may be in a form a solid state memory, a hard drive memory, cloud memory, thumb drive, server memory, computing device memory, and/or other physical medium for storing digital information.

While particular combinations of various functions and features of the one or more embodiments have been expressly described herein, other combinations of these features and functions are likewise possible. The present disclosure is not limited by the particular examples disclosed herein and expressly incorporates these other combinations. 

What is claimed is:
 1. A method for execution by one or more processing modules of one or more computing devices of a dispersed storage network (DSN), the method comprises: allocating a plurality of DSN address ranges to one or more DSN memories of the DSN; assigning a first DSN address range of the plurality of DSN address ranges to a first tenant of the DSN; assigning a second DSN address range of the plurality of DSN address ranges to a second tenant of the DSN; receiving, from the first tenant, a write request for a data object, wherein the data object is segmented into a first plurality of data segments; dispersed error encoding the first plurality of data segments in accordance with first dispersed error encoding parameters to produce first sets of encoded data slices (EDSs), wherein each set of EDSs of the sets of EDSs corresponds to a respective one data segment of the plurality of data segments; receiving, from the second tenant, a write request for another data object, wherein the another data object is segmented into a second plurality of data segments; dispersed error encoding the second plurality of data segments in accordance with second dispersed error encoding parameters to produce second sets of encoded data slices (EDSs), wherein each set of EDSs of the sets of EDSs corresponds to a respective one data segment of the plurality of data segments, and wherein the second dispersed error encoding parameters are different from the first dispersed error encoding parameters; and transmitting the first sets of EDSs and the second sets of EDSs in the one or more DSN memories.
 2. The method of claim 1, wherein the first and second tenants are each associated with one or more users of the DSN.
 3. The method of claim 1, wherein each EDS of the first sets of encoded data slices includes information that can be used to identify each EDS of the first sets of encoded data slices as being associated with the first tenant.
 4. The method of claim 3, wherein the information that can be used to identify each EDS of the first sets of encoded data slices as being associated with the first tenant includes at least one of authentication information, user identification, associated group information, and unique data associated with an authentication system.
 5. The method of claim 3, wherein the information that can be used to identify each EDS of the first sets of encoded data slices as being associated with the first tenant includes at least one of network lookup data, one or more associated network domain data, specific source host data, and internet protocol data.
 6. The method of claim 3, wherein the information that can be used to identify each EDS of the first sets of encoded data slices as being associated with the first tenant includes examining the access request to determine which of at least one of an object, a file, a container, a bucket and vault is being accessed.
 7. The method of claim 1 further comprises: determining, by a first distribution agreement protocol, a DSN address for each EDS of the first sets of encoded data slices; and determining, by a second distribution agreement protocol, a DSN address for each EDS of the second sets of encoded data slices.
 8. A computing device comprises: an interface for interfacing with a network; memory; and a processing module operably coupled to the interface and to the memory, wherein the processing module is operable to: allocate a plurality of DSN address ranges to one or more DSN memories of the DSN; assign a first DSN address range of the plurality of DSN address ranges to a first tenant of the DSN; assign a second DSN address range of the plurality of DSN address ranges to a second tenant of the DSN; receive, from the first tenant, a write request for a data object, wherein the data object is segmented into a first plurality of data segments; dispersed error encode the first plurality of data segments in accordance with first dispersed error encoding parameters to produce first sets of encoded data slices (EDSs), wherein each set of EDSs of the sets of EDSs corresponds to a respective one data segment of the plurality of data segments; receive, from the second tenant, a write request for another data object, wherein the another data object is segmented into a second plurality of data segments; dispersed error encode the second plurality of data segments in accordance with second dispersed error encoding parameters to produce second sets of encoded data slices (EDSs), wherein each set of EDSs of the sets of EDSs corresponds to a respective one data segment of the plurality of data segments, and wherein at least one of the second dispersed error encoding parameters are different from the first dispersed error encoding parameters; and transmit the first sets of EDSs and the second sets of EDSs to the one or more DSN memories.
 9. The computing device of claim 8, wherein the first and second tenants are each associated with one or more users of the DSN.
 10. The computing device of claim 8, wherein each EDS of the first sets of encoded data slices includes information that can be used to identify each EDS of the first sets of encoded data slices as being associated with the first tenant.
 11. The computing device of claim 10, wherein the information that can be used to identify each EDS of the first sets of encoded data slices as being associated with the first tenant includes at least one of authentication information, user identification, associated group information, and unique data associated with an authentication system.
 12. The computing device of claim 10, wherein the information that can be used to identify each EDS of the first sets of encoded data slices as being associated with the first tenant includes at least one of network lookup data, one or more associated network domain data, specific source host data, and interne protocol data.
 13. The computing device of claim 10, wherein the information that can be used to identify each EDS of the first sets of encoded data slices as being associated with the first tenant includes examining the access request to determine which of at least one of an object, a file, a container, a bucket and vault is being accessed.
 14. The computing device of claim 10, wherein the processing module is operable to: determine, by a first distribution agreement protocol, a DSN address for each EDS of the first sets of encoded data slices; and determine, by a second distribution agreement protocol, a DSN address for each EDS of the second sets of encoded data slices.
 15. A dispersed storage (DS) module comprises: a first module, when operable within a computing device, causes the computing device to: receive a write request for a set of dispersed error encoded data slices (EDSs) from a first user; a second module, when operable within the computing device, causes the computing device to: based on information associated with the write request, determine which tenant of a plurality of tenants are associated with the set of dispersed error EDSs; a third module, when operable within the computing device, causes the computing device to: execute a mapping of the write request for the set of dispersed error EDSs to a first set of memory devices, wherein the one or more memory devices are isolated from the memory devices associated with others of the plurality of tenants; a fourth module, when operable within the computing device, causes the computing device to: send information associated with the mapping to the first user, wherein the information associated with the mapping is sufficient to allow the first user to interact directly with the first set of memory devices.
 16. The DS module of claim 15 further comprises: the first module further causes the computing device to receive a write request for a set of dispersed error EDSs from a second user; the second module, when operable within the computing device, causes the computing device to: based on information associated with the write request, determine whether another tenant of a plurality of tenants are associated with the set of dispersed error EDSs from the second user; the third module, when operable within the computing device, causes the computing device to: execute a mapping of the write request to a second set of memory devices, wherein the second set of memory devices are isolated from the memory devices associated with others of the plurality of tenants; the fourth module, when operable within the computing device, causes the computing device to: send information associated with the mapping to the second user, wherein the information associated with the mapping is sufficient to allow the second user to interact directly with the second set of memory devices.
 17. The DS module of claim 15, wherein the information associated with the write request includes configuration data, wherein the configuration data is used by the third module to execute the mapping of the write request to the first set of memory devices.
 18. The DS module of claim 15, wherein the information associated with the write request includes at least one of user identity, associated groups, associated organizations.
 19. The DS module of claim 15, wherein the information associated with the write request includes unique data associated with an authentication system associated with a particular tenant.
 20. The DS module of claim 15 further comprises: a fifth module, when operable within the computing device, causes the computing device to: based on a distribution agreement protocol, determine a DSN address for each EDS of the set of dispersed error EDSs, wherein the distribution agreement protocol is unique to the tenant of a plurality of tenants associated with the set of dispersed error EDSs. 